Electric heater



J. R. GOLDTHWAITE. ELECTRIC HEATER. APPLICATION FILED 050. 4, 1915. RENEWED JUNE 18. 1919. 1,331,496.

Patented Feb. 24, 1920.

E. m f .1 T J N 6 1m M /V u M HH 1 u H- u T A 7 a .1 T .7 q t f, 30 w 9 WITNESSES UNITED STATES PATENT OFFICE.

JOHN RANDALL GOLIDTI-IWAITE, OF ATI ANTA, GEORGIA.

ELECTRIC HEATER,

Specification of Letters Patent.

Patented Feb. 24, 1920.

Application filed December 4, 1915, Serial No. 65,022. Renewed June 18, 1919. Serial No. 305,183.

To all whom it may concern:

Be it known that 1, JOHN R. GOLD- THWAITE, a citizen of the United States, and a resident of Atlanta, in the county of F ulton and State of Georgia, have invented a new and Improved Electric Heater, of which the following is a full, clear, and exact de-'- scri tion.

N y invention relates to electric heaters. The object of the invention is to provide a simple and inexpensive heating device primarily intended for melting wax when sealing and whereby the melting can be done on the spotwhere the seal is to be formed.

The subject matter of this invention is an improvement over my pending application, Serial No. 46,095, filed August 18, 1915.

Reference is to be had to the accompanying drawings, forming part of the specification, in which like characters indicate corresponding parts in all the views.

Figure 1 is an elevation of the device, the novel part thereof being in section to show the details of construction;

Fig. 2 is a horizontal section on line 2-2, Fig. 1; a

Fig. 3 is a fragmentary perspective view of the resistance carrying member; and

Fig. 4 is a perspective viewof the stand for the heater. 7

Referring to the drawings, 4 represents the handle of the casing wherein a circuitclosing switch is provided, a button 5 of which is countersunk in the handle, as shown in dotted lines in Fig. 1, and whereby the switch may be closed when desired The handle 4 flares out into a cup-shaped head' 7 and with which it forms the casing. The

insulator lining necessarily forms an insulator cup within the head of the casing, the bottom of said insulator cup preferably forming a concave paraboloidal surface to which a paraboloidal reflector 9 is secured. A metallic reflecting surface preferably lines the lateral surface of the insulator 8.

The bottom of the head 7 projects below the insulator lining 8 to receive an annular bottom casing 11 of channeled cross section and filled with thermoelectric insulator 12. Any suitable means 13 may be provided for securing the casing 11 to the head 7. Lugs 14 of a thermoelectric insulator ring 15 are anchored within the insulator mass 12 of the casing so that the bottom of the ring 15 is above the surface of the insulator 12.

each lug oneend of an electric resistance element 18 is anchored. The ring has the cross section of 'aniI beam. Notches 19 are provided at the corners of the upper and lower surface of the beam for the resistance element 18 whereby the coils formed on the ring are properly spaced from each other.

Each end of the resistance element 18 is in electrical connection through the medium of a screw 20 with a socket 21 embedded in the insulator 12 of the casing 11. Each socket has an extension forming a plug suitable socket 23 is set into the end of the insulator lining 8 for receiving the plug 22.

Each of said sockets 23 are connected by r a lead 24 to the switch in the handle. The engagement between the socket 23 and the 'plug 22 takes place when the casing 11 is the reflector 9, from where it is reflected through the opening in the bottom casing 11. If a wafer of wax is placed in the sphere of action of the heat rays coming from the reflector the wax will melt, and particularly if it is placed adjacent the focus of the reflector, which is in close proximity to the bottom of the heater, as indicated in dotted lines in Fig. 1. With my device a wax wafer can be melted at any desired spot without bringing the heating device in contact with the wafer and the surface on which the wax is to bemelted. The top of the handle 4 is adapted to receive a die to impress the wax melted bythe device.

The handle 4 of the device has a collar 25 The top of thebracket has a semi-circular recess 28 in the plane with the top, for admitting the device centrally on to the bracket, the part of the bracket forming the recess making a rest for the collar 25,

- adapted to reflect the heat radiated there-- upon from the electric resistance through the annular bottom casing, and means controlling the supply of current to said elec tric resistance.

2, In a device of the class described, a casing having an enlarged cup-shaped head, insulator means lining the head, an annular bottom casing secured to. the head, an insulator ring having the cross section of an I beam carried by said bottom casing so that the same is spaced from said casing, said ring. having a gap, an electric resistance wound about said ring, a reflector associated with the insulator of the head for directing the heat radiated upon it through the annular bottom casing, and means for controlling the supply of current to said electric resistance.

3. In a device of the class described, a casing having an enlarged cup-shaped head, insulator means lining the head, anannular bottom casing secured to the head, said bottom casing being of channeled cross section, insulator means in. said casing, an insulator ring having lugsembedded in the insulator within the bottom casing whereby said ring is maintained concentric with the annular casing and spaced therefrom, said ring having a gap and the cross section of an I beam, an electric resistance wound about said ring, means for controlling the supply of current to said resistance, and a reflector carried by the insulator lining; of the head for reflecting the head from the electric resistance through the annular bottom casing.

4. In a device of the class described, a casing having a cup-shaped head, insulator means lining the head, an annular bottom casing of channeledcross section adapted to besecured' to the head, insulating means carried by said casing, switch plugs embedded in said insulatingineans, switch sockets carried' by the insulator lining of the head and adapted to be engaged by said plug when said annular bottom casing is secured to the recting the heat rays; tl-n-ough the annularbottom casing.

- 5. A portable device for heating waters of sealing wax and the like, comprising a substantially annular electric-al heating element, a suitable support for saidf'element, a casing surrounding said element and sup port and having an opening in its underside, and a reflector with-in the casing and above said heating element adapted to direct the heat rays through said opening and converge them upon a water or other objects to be heated.

6. In a device for h6Z1't-l-11'gW1:f61Sj ofscaling wax and for similar purposes, the combination or a casi nghavingan opening in theunder side thereof, an electric resistance element in said casing symmetrically arranged with respectto and above said opening, and

a reflector in said cas-ing opposite said open.- ing and back of said resistance elementfor converging the heat rays at a point below the casing.

7. A device for heating waters of sealing wax, comprising a casin-g'havi'ng a substa-ir tially circular opening in one sidethe-reoflan electric resistance element in said casing, symmetrically arranged with respect to and above said opening, and a reflector in said casing opposite said opening and back of said resistance element and adapted to reflect the heat raysthrough said opening and converge them. at a point outside the casing.

'8. In anelectric heatingdevice, the combination of a hollow casing com-prising complementary members and havinga heat re fleeting surface on the interior thereof, and an electrical" resistance element in said casing, said casing having an opening in the wall thereof opposite said reflecting surface whereby heat genera-ted by said resistance element will be reflected out of the casing through said; opening.

In testimony'whereof I have signed my name to this specification in the presence of two subscribing witnesses.

J OHN RANDALL GOLDTHWAITE. VVitnessesj:

D. L. FARMER,

F.- SMITH. 

